One problem related to axle shaft has been reported for the 2007 Dodge Ram 1500. The most recently reported issues are listed below.
Experienced strong vibration in front left side of vehicle, as though driving on rumble strip on highway. Speed was irrelevant, anywhere from 25 mph and above. Felt as though it was a locked caliper or other wheel/brake issue. Brought to dealership where truck was always maintained, and after their inspection, they find nothing. This was March, 2010. Experienced same vibration intermittently throughout summer of 2010. Vibration became a common occurrence. At times it feels as though I was driving on the rim. In November, 2010, brought to another dealership for same complaint. They find front axle shaft requiring replacement, which was covered under powertrain warranty. Also found was front hub and bearing requiring replacement, which was not covered under warranty. This failure appears to be the subject of 2006 model year recalls.